JULMATCH : Matching of a reconstructed charged track with a MC ``truth" track

The routine JULMATCH checks if a reconstructed track comes from a ``truth" track at the FKIN (generator) level. See the note of D.Brown ALEPH 94-135 (PHYSIC 94-118) for more details.

IALTRK

Input argument : Alpha index of a reconstructed charged track (between KFCHT and KLCHT)

IMCTRU

Alpha index of the ``truth" track (between KFMCT and KLMCT)

= 0 if no matching found (IFLAG described below is -2 or -3)

IFLAG

Flag describing the matching status:

• -3 Hits not related to MC true hits
• -2 Hits mixed from several MC true particles (not decays)
• -1 Spiral branch or calorimetric reflection
• 0 Double counted particles (2 tracks for 1 true particle)
• 1 True track comes from true primary
• 2 True track comes from HF decay
• 3 True track comes from neutral decay
• 4 True track comes from charged decay (split kink)
• 5 Kink fit as 1 track
• 6 True track comes from material interaction
• 7 Unknown